mktree --missing: updated usage message and man page

Update usage message in builtin-mktree.c to include '--missing'.  Do the
same to man page and clarify that the input does not have to be sorted.

Signed-off-by: Josh Micich <josh.micich@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/builtin-mktree.c b/builtin-mktree.c
index e1c9a27..5ff0475 100644
--- a/builtin-mktree.c
+++ b/builtin-mktree.c
@@ -63,7 +63,7 @@ static void write_tree(unsigned char *sha1)
 }
 
 static const char *mktree_usage[] = {
-	"git mktree [-z]",
+	"git mktree [-z] [--missing]",
 	NULL
 };